Nernst Equation Calculator Help

This calculator uses the following formulas:

E = E_a+2.3 * [(R*T)/(v*F)] * log(a)

Where:

E = Measured total potential of the system
E_a = Portion of the total potential due to reference electrodes and internal solutions
R = Universal gas constant (mol)
F = Faraday's constant (mol)
v = Charge on the ion
T = Temperature (Kelvin)
a = Activity of the ion in the sample solution